Portable evaporative cooler



FIG. 1 is a perspective view of a portable evaporative cooler showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a side elevational view thereof; with the view from the other side being a mirror image thereof; and,

FIG. 4 is a top plan view thereof.

The back is flat and unornamented and forms no part of the claim. 

CLAIM The ornamental design for a portable evaporative cooler, as shown and described. 